78265722319 has 4 divisors (see below), whose sum is σ = 80964540360. Its totient is φ = 75566904280.

The previous prime is 78265722299. The next prime is 78265722361. The reversal of 78265722319 is 91322756287.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78265722319 - 2¹¹ = 78265720271 is a prime.

It is a super-2 number, since 2×78265722319² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78265722919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349408977 + ... + 1349409034.

It is an arithmetic number, because the mean of its divisors is an integer number (20241135090).

Almost surely, 2^78265722319 is an apocalyptic number.

78265722319 is a deficient number, since it is larger than the sum of its proper divisors (2698818041).

78265722319 is a wasteful number, since it uses less digits than its factorization.

78265722319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698818040.

The product of its digits is 2540160, while the sum is 52.

The spelling of 78265722319 in words is "seventy-eight billion, two hundred sixty-five million, seven hundred twenty-two thousand, three hundred nineteen".